Improved chills for casting car-wheels



UNITED STATES PATENT OFFICE,

THOMAS SHARP, OF CHICAGO, ILLINOIS.

IMPROVED CHILLS FOR CASTING CAR-WHEELS.

Specification forming part of Letters Patent No. 40H90, dated October 6, 1863.

To all whom, it may concern.-

Be it known that I, THOMAS SHARP, of Chicago, in the county of Cook and State of Illinois, have invented anew and useful Improvement in Chills for Casting Car-/Vhe'els; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings and the letters and figures marked thereon, which form part of this specification.

In the said drawings, which are hereunto annexed, Figure l represents a plan or top view of my invention, and Fig. 2 a sectional side view thereof at the line x in Fig. l.

Similar letters of reference in the different iigures indicate corresponding parts of my invention;

The object of my invention is to obtain a chill within which a car-wheel provided with two flanges may be cast, and from which such car-wheel may be removed or taken out with as much facility as the ordinary one-hanged .car-wheel can be cast in and removed from the ordinary chill for that purpose contrived and constructed.

The nature of my invention consists in providing the chill with an additional groove to adapt it to the additional flange upon the wheel to be east within it, and in constructing the said chill in two parts joined together by a scarf-joint, so that the -said,chill can readily be separated and taken out from between the iianges of the car-wheel, and in providing said chill so constructed, as aforesaid, with a suitable support or re-enforce, to keep the segments of said chill firmly pressed together, and also to keep them in the same plane with each other, so as to prevent any imperfection in the casting, which would inevitably arise from the opening of the joints of the chill or from any displacement ofthe segments from their required position by the upward or downward inclination of either of said segments from the plane of the wheel, cutting the axle at right angles, or by the sinking of either of such segments below said plane.

To enable those skilled in the art to understand how t0 construct and make use of my invention, I will now proceed to describe the same with particularity, reference being had to the drawings hereinbefore mentioned and hereunto annexed.

A A in said drawings represent the chill constructed in two parts, and a c denote the scarf-joints in said chill where the same is divided, c being the groove ordinarily made in said chill, and c being the additional groove. provided for the additionall ange, as aforesaid.

B represents a circular band or re-enforce provided with a circular rim or shelf, d, projecting inward, within and upon which the chill A A rests and is supported, as clearly shown in the drawings. The parts composing the chill are keyed up and kept together, when in use, by means of the thumb-screws b b passing through the re-enforce B, the ends whereof rest against the parts of the chill, as shown, or in any other suitable manner.

The object of providing the ends of the segments composing the chill with the irregular or scarf joints (shown at a a) is to prevent any lateral displacement of the said parts by the sliding of one ofsaid parts by the other, so as to Vcause the interior mold formed by the segments or parts to present the appearance of two semicircles of the same diameter described from different centers, and it will readily be seen that the arrangement of the said scarfjoints a a eectually prevents any such lateral displacement; and as such displacement is very liable to occur from various causes-as sudden jars, unequal expansion, or other disturbing causes-and as it is almost impossible, practically, to adjust the segments so as to lie eX- actly in the same plane, and to remain secure from the disturbances which are so liable to` displace them, so as to insure the casting of a perfect wheel without such devices, I consider the employment of the scarf-joints as constructed and the re-enforce B, in connection with a segmental chill, as a practical necessity, as it is onlyby such a chill that a doubleanged car-wheel cast in a single piece can be properly manufactured, so as to present the proper degree of hardness and durability for practical use. The car-wheels are cast within said chill, the interior configuration thereof molding and forming the exterior or circumference of said wheels, the object of using said chills being to give the requisite degree of hardness and durability to the face of the wheel, which cannot be accomplished by casting said face in the usual sand molds.

tion with the segmental Chill A A, when the latter is constructed and provided with the two grooves c c and the scarf-joints a a', and all are arranged and operating substantially as and for the purposes herein delineated and described.

THOMAS SHARP.

Vitnesses:

NV. E. Mums, XVM. M. XVOOLLEY. 

